The application of ultrafiltration for milk concentration allows obtaining a raw material for yoghurt elaboration, with total solids increased. The products have special characteristics due to different ratios proteins/lactose can be obtained, as well as they have nutritional properties with beneficial effects in human health. In this study the content of calcium, potassium, phosphorous, iron, ...

Neural networks are shown to be useful as emplncal mathematical models m the calculation of quantltatlve analytical results, gvmg sufflclent accuracy to compete successfully with various common cahbratlon procedures. The performance of these neural-network models for cahbratlon data from x-ray fluorescence spectrometry (XRF) was evaluated for two trammg methods, 1 e , backward error propagation...

A study was undertaken to determine if laser-induced breakdown spectroscopy (LIBS) can be a practical and competitive alternative to X-ray fluorescence (XRF) methods for lead-in-paint inspection. Experiments in the laboratory confirmed that LIBS is suitable for detecting lead in paint at the hazard levels defined by federal agencies. Although we compared speed, function and cost, fundamental di...

We present the results from a Hubble Space Telescope/ACS study of the supernovae associated with gamma-ray bursts 040924 (z = 0.86) and 041006 (z = 0.71). We find evidence that both GRBs were associated with a SN1998bw-like supernova dimmed by ∼ 1.5 and ∼ 0.3 magnitudes, respectively, making GRB040924 the faintest GRB-associated SN ever detected. We study the luminosity dispersion in GRB/XRF-as...

Several techniques have been utilized for the preparation of hydroxyapatite (HA) and other calcium phosphates for the development of biomaterials. It is vital to know the reaction kinetics to be able to control the material obtained by the aqueous solution route. In the present work, HA has been produced by different wet precipitation processes and different experimental conditions. Calcium hyd...

An important parameter for the distinction of X-ray flashes, X-ray rich bursts and Gamma-ray bursts in the rest frame is the distance to the explosion site. Here we report on the spectroscopic redshift determination of the host galaxy of XRF/GRB 030528 using the ESO VLT FORS2 instrument. From the strong oxygen and hydrogen emission lines the redshift was measured to be z=0.782±0.001. Obtaining ...

The technique of (109)Cd-based X-ray fluorescence (XRF) measurements of lead in bone is well established. A paper by some XRF researchers [Gordon CL, et al. The Reproducibility of (109)Cd-based X-ray Fluorescence Measurements of Bone Lead. Environ Health Perspect 102:690-694 (1994)] presented the currently practiced method for calculating the variance of an in vivo measurement once a calibratio...